Insulator.



BEST VLE @GRY [EN IFFiC.

GRANT DoBsoN, or Prr'rseune, rnnnsrrvania, assieme or one-nini To RICHARD A.

oHLorr, or rrr'rsnune, rEuNs'rLvAnii.

INSULATOR.

To all whom 'it may concern:

Be it known that I, GRANT Bonson, a'citi-A zen'o the United States, residing at Pit-tsburg, in the k.county of Allegheny and State of Pennsylvaniahayeinvnted certain new and useful Improvements in Insulators, of which the following is a specification, reference being had'therein to the accompanying throwing of stones, etc., and providedwit-h means for adjustment to any supporting base. Referring to the drawings Figure 1 .a vlew 1n front elevation of the device showing the wire in position for being gripped by the holding ring. Fig. 2 is a similar viewg showing the ring turned to holding position] Fig. 3 is a sectional view at right angles 'to Fig. 1. Fig. t is a cross sectional view onv the line IV. IV. looking upwardly. Fig. 5 is a detail View showing a modified form of supporting stem. A

2 represents a central,supporting stem, of metal or any'suitable material, adal'ited to be mounted in an ordinary cross arm 3 of a telegraph or telephone pole by inserting it in a socket therein, or saidv stem may be provided with any suitable base or flanges as indicated in Fig. 5, whereby it may be bolted or screwed upon any surface.

The upper end of stem 2 is recessed as in dicatcd at 4, providing a holding socket for a block 5 of insulating material porcelain, fiber, or other suitable substance. The outer portion of block 5 is lmade cylindrical conforming to the contour of the stem 2, practically .forming a continuation of the exterior ofthe stein, 'and is providedwith a transverse slot or opening 6 adapted to receive the wire 7 crosswise 'when inserted.

The upper portion of socket 6 preferably extends somewhat upwardly and baekwardly from the front upper edge 8 which thus par tially covers the wire when in place. The socket 6 is of ample size 'and opening at the front to admit of the easy insertion of the wire 7 when vthe holding ring is lowered, as

Specification of Letters etent. application met apra 1, isos. serait. massi.

" A in l, while the upward travel of said ring is suiiicient to bind it tightly against the wire underneath, causing the wire to kink at each bearing portion, thereby tixedly securing it in locked position.

9 is the ring referred to, encircling stern 2, and may be of porcelain, ber, or other suitn able insulating material and provided upon its lower edges with one or more series of serra'tions l0 ywith intervening shoulders. Said serrations and shoulders are arranged sloping or spirally, while one or more studs 11 which may be in the form of a pin, are inserted erosswise through the stem 2, and are so arranged that when the ring S) is ro- .itatedA the serrations 10 will ride over -the jstuds l1 and will interlock therewith when the uppei'edge of the-ring has been forced into suiliciently tight engagement against the wire to positively clamp it.

rThe ring 9 may be made cylindrical as shown and is capable of being turned with the tinge-rs or a pipe wrench, or it may be provided with lugs or, flat faces around its surface for engagement by an ordinary nut wrench.

The device may be made in any desired design or proportions, and when mounted in any other manner than that shown the base of stein 2 may be provided with langcs 12 arranged ati-ight angles to the stem or at any other desired angle as indicated in dotted lines, so as to secure the stem upon a horizontal or vertical surface or wall to locate the stem at any desired angle.

Having described niy invention, what I claimY is l. An insulator consisting of a supporting stein provided with an insulating block having a groove, and a ring of insulating material surrounding the stem and arrange to engage the wire when inserted in said block, substantially set forth;

2. An insulator consisting of a supporting stern provided-with an insulating block having a groove, and a ring of insulating ma.- terial surrounding the stem and arranged to engage the wire when inserted in said block, with means for holding the ring in clamping position, substantially as set forth.

3. An insulator consisting of a cylindrical supporting stem having a lateral socket or recess, a block of insulating material set in4 said recess and provided with ya transverse wire receiving groove, and a clamping ringr 110 Patented oct. 13, 190s.

of insulating material embracing the stem and block and provided Withvmeans for en gaging a fixed locking abutment on the stem, substantially as set forth. l

4. In n.11 insulator, the combination of a stem provided with e locking abutment and a recess, an insulating block set in saidrecess end provided with a transverse wire opening, and. a-rlng of insulating material encir-.

cling the stem and block and provided with a. series of serrntions or shoulders upon lts loiret edge' lapted vto engage the locking' abutment to clamp against a wire inserted in the ulpening of thebloek, substantially as fort 16 In testimony whereof I affix my signaturo v C. M. CLARKE', Cms. S. LEPLEY. 

